830 horsepower increase

I am restoring a 830 John Deere and have the motor bored 125 over and have new aluminum piston. I have larger exhaust valves installed and I am going to have the injectors rebuilt. I wat to get around 100-125 hp . What should I do to get to this point. I am trying not to go to extreme because I stil want to use this for plowing and baling hay. Thanks, scott

I'm pretty sure I know who you mean. He's an older fella and his super is in excellent shape. I like that tractor a lot. He usually always shows up for the King of the Mountain pull but he doesn't weigh his up to win it. I've wondered how it would do if he loaded it up.

Risk of building up an R is the crank doesn't have a center main. That's why I didn't hop up the R that I had. The70, 720's and 730's are a lot lighter than the R, 80, 820, 830's. Kind of depends what you want to do with it and how far you want to go with it.

there's a guy with an Oliver Super 99 Detroit that wins the Mercer County pull every year at Stoneboro, that thing would give him a run for his money. what all do you have done to it? I'd like to build a diesel of some sort, an R or a 720. would love to meet someone locally who knows what they are doing, my experience is limited to putting new piston rings in my B.

I don't really pull much. I live close to where our club pulls so I can just ride it up to the track. We pull at the Big Knob Grange and the club is called The Big Knob Antique Tractor and Equipment Association. Or BKATEA for short? The other pull... and really the one I built this for... Is the King of the Mountain pull in Portersville during the fall steam show. If you happened to be there this last year you would've witnessed my humiliating two foot pull...! Got muddy as all get out and I was whooped by a couple folks with skinny tires that could churn down and grab some dirt.

Won it the year before though... I had an R that I was pulling with and started getting tired of getting beat. Not many pulling the heavier classes in our club so sometimes I could get a second or third... if only two or three pulled...!! So I got a wild hair up my butt to build something a little stronger.

Not for the next class.... It wasn't a pull. My buddy brought his skid steer up to load the sled for me and I ran it down to where the barrels get offloaded. Some other friends just wanted to see it run. I'd been working on it for about three years before I got to light it up and I guess with all the b.s.-ing for years they wanted to see what it'd do as bad as I did.

My 820 isn't built to the hilt like the Full strut tractors but it's strong. The video below was a practice pull shortly after I got the thing back together. A little too much fuel but not too far off. I'm looking into some air cleaner improvements to help get more air in there and will leave the rack alone until I see what happens with better breathing. Towards the end of this pull (if it comes up?) I backed out of the throttle to see how much to drop the front end back down and when I put it back to full it came right back strong.

Don't just run the rack wide open... It'll be too much fuel and actually a loss of power. Your rack is probably set around 8-10 range... I don't remember factory setting... but wherever it is is where it needs to be unless you can provide more air.

The .125 overbore increased your cylinder volume 4% so 4 percent of the total fuel required prior is about half a line on the rack. (That's assuming about 10 setting before so 4% of 10 is .4 of a line increase.)

Head work and bigger valves... changes in your filter... could get you more air and allow for more fuel... which will get you more power.

These engines had volumetric efficiency limitations (not enough air). Adding more fuel normally gives you lots of smoke with minimal H.P. increase. Have heard of people adding a turbo with an accumulator tank but never seen any pictures or documentation.

Rather optimistic for 125HP. Won't see a lick or difference between 45, 90 and 125 over pistons even on a dyno. If the bores cleanup with 45 thous, stay with 45 thou. Talking cam, porting, re-worked intake and exhaust manifolds. Maybe 100HP at pto speed. Higher than rated rpm for 125HP.

Ask the guys over on the pulling forum. Problem is getting them to spill the beans. You will need large buckets of $ also. In my opinion you should be able to get 80-85 just opening the rack all the way. With pump/ injector work & 20% rpm increase 90-95hp. I wouldnt work it in a field that way, set rpm back to stock & dont load it heavy, but it should make close to that. Bigger intake valves, head work & a cam will help alot as has been mentioned.

Few "Pulling Tractors would do well doing "Field Work..but I'd bet that 830 would be at home under "normal loads" for an 830...

Wonder what the hp WOULD BE FOR THAT 830 AND 720..??..!!!!!!

They sure don't Pull-Down..!!!

A fellow here that pulls in Plain City, Ohio has a JD 70 D that is one that is just a pleasure to hear and see pull... it has that Crisp throttle response..even at at Idle, of a good sharp "Gas" JD and does NOT smoke a lick under what would be a load a normal 70 would be over-loaded and acts like it has not even been hooked to the sled...!!! I know he said it had a different Cam and the Injectors were re-worked, with a Higher cracking pressure...not aware of what else may have been done.. Ron.

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